<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>css三大特性</title>
    <style>
        #d1{
            color :red;
        }
        p{
            color:blue;
        }
    </style>
</head>
<body>
<div id="d1">
    <p>这是p标签</p>
    <a href="">超链接</a>

</div>
</body>
</html>